1 /* 2 * Copyright 2010-2012 Haiku, Inc. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Francois Revol 7 * Ithamar R. Adema, ithamar.adema@team-embedded.nl 8 * Alexander von Gluck, kallisti5@unixzen.com 9 */ 10 #ifndef _ARCH_ARM_ARM_MMU_H 11 #define _ARCH_ARM_ARM_MMU_H 12 13 14 /* 15 * generic arm mmu definitions 16 */ 17 18 /* 19 * L1 defines for the page directory (page table walk methods) 20 */ 21 #define ARM_MMU_L1_TYPE_FAULT 0x0 22 // MMU Fault 23 // 31 2 10 24 // | |00| 25 #define ARM_MMU_L1_TYPE_SECTION 0x2 26 // Single step table walk, 4096 entries 27 // 1024K pages, 16K consumed 28 // 31 20 19 12 11 10 9 8 5 432 10 29 // | page table address | 0? | AP |0| domain |1CB|10| 30 #define ARM_MMU_L1_TYPE_FINE 0x3 31 // Three(?) step table walk, 1024 entries 32 // 1K, 4K, 64K pages, 4K consumed 33 // 31 12 11 9 8 5 432 10 34 // | page table address | 0? | domain |100|11| 35 #define ARM_MMU_L1_TYPE_COARSE 0x1 36 // Two step table walk, 256 entries 37 // 4K(Haiku), 64K pages, 1K consumed 38 // 31 10 9 8 5 432 10 39 // | page table address |0| domain |000|01| 40 41 #define ARM_MMU_L1_FLAG_PXN 0x00000004 42 43 // the domain is not used so and the ? is implementation specified... have not 44 // found it in the cortex A8 reference... so I set t to 0 45 // page table must obviously be on multiple of 1KB 46 47 #define ARM_MMU_L2_TYPE_LARGE 0x1 48 #define ARM_MMU_L2_TYPE_SMALLNEW 0x2 49 #define ARM_MMU_L2_TYPE_SMALLEXT 0x3 50 51 #define ARM_MMU_L2_FLAG_XN 0x001 52 #define ARM_MMU_L2_FLAG_B 0x004 53 #define ARM_MMU_L2_FLAG_C 0x008 54 #define ARM_MMU_L2_FLAG_AP0 0x010 55 #define ARM_MMU_L2_FLAG_AP1 0x020 56 #define ARM_MMU_L2_FLAG_TEX0 0x040 57 #define ARM_MMU_L2_FLAG_TEX1 0x080 58 #define ARM_MMU_L2_FLAG_TEX2 0x100 59 #define ARM_MMU_L2_FLAG_AP2 0x200 60 #define ARM_MMU_L2_FLAG_S 0x400 61 #define ARM_MMU_L2_FLAG_NG 0x800 62 63 #define ARM_MMU_L2_FLAG_HAIKU_SWDBM ARM_MMU_L2_FLAG_TEX2 64 // reuse TEX[2] for software-emulated Dirty Bit Modifier 65 66 #define ARM_MMU_L2_FLAG_HAIKU_KERNEL_RW (ARM_MMU_L2_FLAG_TEX2 | ARM_MMU_L2_FLAG_AP0) 67 // allow read and write for kernel only 68 // set Accessed and Modified flag during early page mapping 69 // as the exception handler may be not available yet 70 71 #define ARM_MMU_L1_TABLE_ENTRY_COUNT 4096 72 #define ARM_MMU_L1_TABLE_SIZE (ARM_MMU_L1_TABLE_ENTRY_COUNT \ 73 * sizeof(uint32)) 74 75 #define ARM_MMU_L2_COARSE_ENTRY_COUNT 256 76 #define ARM_MMU_L2_COARSE_TABLE_SIZE (ARM_MMU_L2_COARSE_ENTRY_COUNT \ 77 * sizeof(uint32)) 78 79 #define ARM_MMU_L2_FINE_ENTRY_COUNT 1024 80 #define ARM_MMU_L2_FINE_TABLE_SIZE (ARM_MMU_L2_FINE_ENTRY_COUNT \ 81 * sizeof(uint32)) 82 83 /* 84 * definitions for CP15 r1 85 */ 86 87 #define CR_R1_MMU 0x1 // enable MMU 88 #define CP_R1_XP 0x800000 89 // if XP=0 then use backwards comaptible translation tables 90 91 92 #define VADDR_TO_PDENT(va) ((va) >> 20) 93 #define VADDR_TO_PTENT(va) (((va) & 0xff000) >> 12) 94 #define VADDR_TO_PGOFF(va) ((va) & 0x0fff) 95 96 #define ARM_PDE_ADDRESS_MASK 0xfffffc00 97 #define ARM_PDE_TYPE_MASK 0x00000003 98 99 #define ARM_PTE_ADDRESS_MASK 0xfffff000 100 #define ARM_PTE_TYPE_MASK 0x00000003 101 102 #define ARM_PTE_PROTECTION_MASK 0x00000121 // SWDBM, AP[1], XN 103 #define ARM_PTE_MEMORY_TYPE_MASK 0x0000004c // TEX[0], B, C 104 105 #endif /* _ARCH_ARM_ARM_MMU_H */ 106